Induced spin velocity of the Earth and its influence to the seasonal variation of the Earth's angular velocity

We examine the induced spin velocity in case of the Earth. Spin velocity is induced from the conversion of a constrained spatial rotation into a spatial displacement. Its effects on Earth as a celestial body are consequences of its properties and they are examined in detail. The induced spin velocity has influence to the semiannual variation of the length of day. The annual and semiannual variation of the length of day are considered separately. The measured value in case of the semiannual variation of the length of the day is 5.44% more than the predicted, while the measured value in case of the annual variation of the length of the day is 5.36% less than the predicted.